Plunger



March 26, 1935. N, R BECK 1,995,662

PLUNGER Filed Aug. 18, 1933 www Patented Mar. 26, 1935 PATENT OFFICE PLUNGER Norman R. Beck, Baltimore, Md., assignor to Carr-Lowrey Glass Application August 18,

4 Claims.

This invention relates to a plunger for use in shaping blanks in the production of partitioned glass bottles or other containers.

. Itis designed moreY especially for use in carrying lout the methoddisclosed in the co-pending application of I-Iilgenberg and Garwood, led December 2'?, 1932, Serial Number 649,094.

In following the method referred. to the blank is initially subjected to the action of a forked plunger which produces separate pockets spaced by a partition. Thereafter, following the removal of the plunger and while the blank is supported in a blow mold, air is directed into the pockets and produces a container having a partition and separate pockets shaped and located as desired.

It has been found in practice that when the plunger is forced into the blank, a certain amount of air becomes trapped in the crotch and this air interferes with the complete filling of the space between the fork members. Consequently it has not been possible to provide a partition reaching to the desired elevation within the neck of the finished container.

An object of the present invention is to provide a forked plunger with a vent through which air can escape freely during the insertion of the plunger into the glass, thereby eliminating all danger of trapping air and interfering with the proper shaping of the upper edge of the partition.

Another object is to provide a plunger so constructed as to make it possible readily to produce a vent of such proportions as to permit the escape of air without allowing the glass to rise above the proper level.

With the foregoing and other objects in view which will appear as the description proceeds, the invention consists of certain novel details of construction and combinations of parts hereinafter more fully described and pointed out in the claims, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed.

In the accompanying drawing the preferred form of the invention has been shown.

In said drawing:

Figure 1 is a view partly in section and partly in elevation showing the plunger and a portion of a parison shaped thereby.

Figure 2 is an elevation of the plunger viewed at right angles to Figure 1. i

Figure 3 is a bottom plan view of the plunger.

Co., Baltimore, Md.

1933, Serial No. 685,777

Figure 4 is a section through the plunger taken on line 4 4, Figure 1.

Figure 5 is an enlarged section through a portion of the plunger taken on line 5--5, Figure 2.

Referring to the figures by characters of reference 1 designates the head of the plunger having a tongue 2 extending from one end thereof providedrwith an angular offset 3 close to the head. This tongue has a fiat inner side 4 adapted to be contacted by the inner side ofa block 5 which is cut away at 6 to receive the off-set 3. The block is held rigidly to tongue 2 by a transverse pin'7.

Block 5 has a lower off-set 8 at the lower end of its inner surface 9 and from this off-set 8 the tongue 2 and block 5 diverge downwardly as indicated at l to provide a crotch. The off-set 8 is preferably concaved in the direction of its length as shown by broken lines in Figure 2 although it is to be understood that this configuration can be varied to meet the requirements.

The inner surface 9 of block 5 is formed with abroad shallow channel 11 extending from offset 8 to off-set 3 and when the block 5 and tongue 2 are assembled as shown, this channel 11 forms ar slit-like vent leading to the off-set 3. The block is rounded at the upper end of its surface 9 as indicated at 12 so that air owing upwardly within the channel 11 can escape radially along this rounded corner portion as will be plainly apparent by referring to Figure 5.

In the formation of a parison P the blank, while held in a neck ring N, is subjected to pressure from the forked end of the plunger which, entering the neck portion of the parison, will produce recesses or pockets R separated by a partitionor dividing portion D. As the glass is forced into the crotch portion of the plunger, any air that may be located above the glass, can escape freely through the vent channel 11 and laterally at 12 so that the glass can ll all of the space below the off-set 8. Consequently proper shaping and positioning of the upper edge of partition D will not be interfered with.

By forming the plunger of two pieces held together as described the vent channel can be produced readily and can be so proportioned as to permit free escape of air without allowing the glass to ow upwardly into the channel.

What is claimed is:

1. A plunger for shaping glass parisons, having a forked end and an air vent leading from the crotch of the fork and extending longitudinally of the crotch.

and leading from the crotch of the fork, said vent extending longitudinally of the crotch.

4. A plunger for shaping glass parisons including a tongue and a block secured to the tongue, said block and tongue having spaced portions at one end providing a crotch, there being a. broad, shallow channel in the block leading from the crotch at one end and opening at its other end laterally through the plunger, said channel providing an unobstructed air vent extending longi- 10 tudinally of the crotch.

NORMAN R. BECK. 

